Self-propelled machine for handling forgings



Sept. 30, 1941. H. DIENENTHAL ET AL SELF-PROPELLED MACHINE FOR HANDLINGFORGINGS Filed Nov. 16, 1938 2 Sheets-Sheet l p 1941- H. DIENENTHAL ETAL2,257,546

SELF-PROPELLED MACHINE FOR HANDLING FORGINGS Filed Nov. 16, 1938 2Sheets-Sheet 2 Patented Sept. 30, 194i FORGINGS Herbert Dienenthal andTheo Zimmermann, Siegen, Westphalia, Germany Application November 16,1938', Serial No. 240,764 r In Germany November 18, 1937 6 Claims},

Self-propelling machines for holding and turning heavy work to be forgedare known in which a device which carries the tongs for holding the workcomprises a number of parts which are able, to make angular movementsrelatively one to another, and pressure or tension springs, which arefitted between these parts take up the additional load which occursduring forging. However, when a machine of this kind is actually used,it has been found that the device which carries the tongs behaves as ifit were almost entirely rigid since the springs are too short to act aseffective buffers. advantage is that in the known machine the carrierfor the tongs is supported by-twolifting cylinders which actindependently. It is then impossible to prevent the movements of 'thelifting cylinders differing somewhat from one another, the result ofwhichis that the carrier does not maintain a horizontal position as isdesired when forging. a

Now the object of the present invention is to provide an'apparatusof thekind described in which the aforesaid disadvantages are" ob-- viated.According to the invention the carrier for the tongs is resilientlysuspended from four points on a linkage whichis actuated by-a singlelifting cylinder. In one preferred form of construction-a pair ofbell-crank levers is pivoted at each, side to the "frame of the machine,and the levers of each pair are linked together by a bar connected tothe end of one arm of each of the levers while tothe ends of the otherarmsof the four levers are pivoted four upright rods whichcarry longhelical springs on which the carrier for the tongs is supported. Thesesprings take up the weight of the carrier which is distributed uniformlyover the four points of suspension and they are able to support and holdthe carrier securely in the horizontal position in which it is-alwayssetbymeans of the lifting cylinder which acts on the-linkage. Under theadditional load which occurs during forging the springs yield uniformlyas 'a whole in a vertical direction, that is to say in the direction inwhich the additional load acts.

Further, in accordance also: with the invention,-

A further dismotor 4.

this position. The carrier is therefore able to makelongitudinalmovements and can yieldunder the load which occurs owing to extensionduring forging while the vertical supporting springs can swing about thepivots on which the rods which support them are mounted. The

carrier therefore always maintains its horizontal position.

A constructional embodiment of a machine in accordance with theinvention is illustrated by in which Figure 1 is a side elevation of themachine,

Figure 2 shows the central portion of the machine with the carrier forthe tongs displaced,

Figure 3 shows three sections on the lines AB and CD of Figure 2respectively,

Figure 4 is a broken-off the 1ine AA of Figure 5, and

Figure 5 is a broken-off horizontal section on line 3-3 of Figure 4.

Referring tothe drawings, the frame I of the self-propelled machine issupported on wheels 2, 3, of which the steering wheel 2 isldriven by aThe driving gear of the vehicle has two separate controls. For fastrunning for carrying and conveying the billets to be forged, the motoris controlled by means. of a controlling drum. When forging, on theother hand, the machine can be intermittently moved for- Wards orbackwards by foot-actuated pedals in accordance with the feed necessaryduring forging.

On pivots 5 and 6 at each longitudinal side of theframe vl are pivotallymounted bell-crank levers 1, 8 which are connected transversely in pairsby pivot bars 9, l0 respectively, and longitudinally in pairs by rodsII. A lifting cylinder l2 in the centre of the machine acts on the pivotbar I 0. The lifting cylinder (Figures 4 and 5) is supported throughtrunnion pins c by. brackets d carried by a transverse plate e which issecured at each end to frame I. Piston ,f carries piston rod a which issecuredto pivot bar II). On each side of the piston, the cylinder is incommunication through pipes g, h and suitable valves with a source offluid under pressure, whereby the ,piston may be reciprocated to rockbell-crank levers 8 and, through rods H, levers 1. The cylinder rocks inresponse to changes in elevation of bar Ill. The other ends of thelevers carry, on pivots l3, [4, long vertical bolts l5 and I6 aroundwhich are disposed helical springs I1 and IS on which 7 supporting arms19, 20 for the member 2| which vertical section on" at each side of themachine. The helical springs act, through the agency of the bushes 30,3|,

uniformly on both sides of the machine against moving heavy work to beforged, comprising a wheeled frame, means for propelling the frame, atongs for holding the work, a pair of bell-crank levers pivotallymounted at either side of said frame, a bar pivoted to one arm of eachlever of each pair of said levers, upright rods pivoted to the otherarms of said levers, helical springs disposed around said rods, memberssupported on and partly enclosing said springs and slidable on saidrods, pivots on said members, a tongs-carrying member, arms on saidtongs-carrying member mounted on said the eyes 21 and 28 of the carrierand therefore tend to hold the carrier in the central position; Theactual tongs 33 for holding the work to be forged are revolubly mountedthe carrier 2|- on a rigid holder 35. It may be opened in known pivotsand a single lifting cylinder by which said bell-crank levers can beturned about their pivots.

4. A self-propelled machine for holding and moving heavy work to beforged, comprising a wheeled frame, means for propelling the frame,

manner from the drivers seat 36 and, can be.

rection, that is to say in the direction in which the additional load isexerted. Horizontal displacements are taken upby the springs 32, one orother of the sleeves 30 and 3| being shifted on the bolt 29, as shown inFigure 2.- The rods l5 and I6, together with the springs l1, l8 therebyswing about the pivots l3 and I4 so that the horizontal position of thecarrier and the parts associated with itis maintained.

The machine may run without rails or; may be constructed as a railvehicle.

We claim:

1. A self-propelled machine for holding and moving heavy Work to beforged, comprising a Wheeled frame, means for propelling the frame, atongsfor holding the Work, apair, of "belle crank levers pivotallymounted at either side of said frame, aibar pivotedjto one arm ofgeach'lever of each pair of said levers, upright rods pivoted to the otherarms .of said levers, helical springs disposed around said rods, atongs-care rying member supported by said helical springs, and a singlelifting cylinder by which said bellcrank levers can be turned abouttheir pivots 2. A self-propelled, machine forholding and moving heavywork to be forged, comprising a wheeled frame, means for propelling theframe, a tongs for holding the work, apair of bell crank leverspivotally mounted at either side of said frame, a bar pivoted to one armof each lever of each pair of said levers, upright rods pivoted to the.other arms of said levers,- helical; springs disposed around said rods,members sup-.

ported on said springs and slidable on said. rods, pivots on saidmembers, a tongs-carrying member, arms. on said tongs-carrying membermounted on said pivots, and a single lifting:

cylinder by which said bell-crank levers canbe turned about theirpivots.

.3. A self-propelled machine for. holding' a nd a tongs for holding thework, a pair of bellcrank levers pivotally mounted at either side ofsaid frame, a bar pivoted to one arm of each lever of each pair of saidlevers, upright rods pivoted to the other arms of said levers, helicalsprings disposed around said rods, a tongs-carrying member supported bysaid helical springs, a buffer frame connected to one arm of each leverof each pair of said levers, resilient means whereby said buffer frameis normally held ina central position and a single lifting cylinder bywhich said bell-crank levers can be turned about their pivots.

5. A self-propelled machine for holding and moving heavy work to beforged, comprising a wheeled frame, means for propelling the frame,

a tongs for holding the work, a pair of bellcrank leverspivotallymounted at either side of said frame, a bar-pivoted to one arm of eachlever of each pair of levers, upright rods pivoted to the other arms ofsaid levers, helical springs disposed around said rodsya tongs-carryingmember supported by said helical springs, a buffer frame connected toone arm of each lever of each pair of said 'levers,helical springsparallel to the axis of the tongs-carrying member whereby saidbufierframe is held in a central position and a single lifting cylinder bywhich said bell-crank levers can be turned about their pivots. 1

6. A self-propelled machine for holding and movingheavy work tobeforged, comprising a wheeled frame, means for propelling the frame, atongs for holding the work, a pair of bellcrank levers pivotally mountedat either side of said frame, a bar pivoted to one arm of'each lever ofeach pair of said levers, upright rods pivoted to the other arms of saidlevers helical springs disposed around said rods, a tongs-care ryingmember supported by said helical springs,

a buffer frame connected to one arm ofv each;

lever of each pair of said levers, apertured lugs on said bufferframe,apertured lugsj on, said tongs-carrying member, a rod fixedintheapertures in said last-mentioned lugs and slida ble in the apertures inthe first-mentioned lugs, sleeves on said rod slidable in saidfirst-mentioned apertures, collars on said sleeves, a, springbearingagainst said collars and a single lifting cylinder by which saidbell-cranklevers-can be turned 1 abouttheir pivots. i

I .=.I-IERBERT DIENENTHAL. THEO ZIMMERMANN.

